Amphastar Pharmaceuticals Inc.
Last updated September 27, 2026
Organization details
- Legal name
- Amphastar Pharmaceuticals Inc.
- Ownership
- Public
- Status
- Active
- SIC code
- 2834 — Pharmaceutical Preparations
- Headquarters city
- Rancho Cucamonga
- Headquarters state / province
- California
- Headquarters country
- United States
- Fiscal year end
- December
- Ticker symbol
- AMPH
- Primary stock exchange
- Nasdaq
Identifiers
- SEC CIK
- 0001297184
- EIN
- 33-0702205
Board of directors
-
Anthony T. Pierce · DirectorSince 2026
-
David Russell Gaugh · DirectorSince 2025
-
Diane G. Gerst · DirectorSince 2023
-
Floyd F. Petersen · DirectorSince 2023
-
Gayle Deflin · DirectorSince 2023
-
Howard Lee · DirectorSince 2023
-
Jack Y. Zhang · Director · CEO & CHIEF SCIENTIFIC OFFICERSince 2023
-
Mary Z. Luo · Director · COO, Chief Scientist, ChairmanSince 2023
-
Michael A. Zasloff · DirectorSince 2023
-
Richard K. Prins · DirectorSince 2023
-
William J. Peters · Director · CFO, EVP & TREASURERSince 2023
-
Yakob Liawatidewi · Director · EVP CORP ADMIN CENTERSince 2023
Chief executives
Jack Y. Zhang
· CEO & Chief Scientific Officer
Dates unknown
Director election results
Annual meeting of June 1, 2026. Support is votes for as a share of votes for and against (or withheld). Below 80% is a clear protest.
-
66.7%
-
99.4%
Board connections
1 of this board's directors also sit on 1 other board.
- via Richard K. Prins
Insider trades
All notable trades →From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.
- Bought, last 12 months
- $0
- 0 purchases by 0 insiders
- Sold, last 12 months
- $1,709,161
- 12 sales by 4 insiders
| Date | Insider | Transaction | Shares | Price | Value |
|---|---|---|---|---|---|
| Sep 21, 2026 | William J. Peters Director, Officer (CFO, EVP & TREASURER) | Open-market sale | −4,139 | $25.00 | $103,475 |
| Sep 16, 2026 | Zhou Rong Officer (SENIOR EVP, PRODUCTION CENTER) | Option exercise | +10,000 | $13.35 | $133,500 |
| Sep 16, 2026 | Zhou Rong Officer (SENIOR EVP, PRODUCTION CENTER) | Open-market sale | −10,000 | $23.94 | $239,404 |
| Sep 2, 2026 | Zhou Rong Officer (SENIOR EVP, PRODUCTION CENTER) | Open-market sale | −3,187 | $23.63 | $75,306 |
| Aug 11, 2026 | Richard K. Prins Director | Open-market sale | −7,973 | $20.30 | $161,852 |
| Aug 7, 2026 | William J. Peters Director, Officer (CFO, EVP & TREASURER) | Option exercise | +5,053 | $19.79 | $99,999 |
| Aug 7, 2026 | William J. Peters Director, Officer (CFO, EVP & TREASURER) | Open-market sale | −8,180 | $22.48 | $183,886 |
| Jul 9, 2026 | Anthony T. Pierce Director | Grant or award | +7,886 | — | — |
| Jun 2, 2026 | Howard Lee Director | Shares withheld for tax | −769 | $18.45 | $14,188 |
| Jun 1, 2026 | Howard Lee Director | Grant or award | +8,143 | — | — |
| Jun 1, 2026 | Michael A. Zasloff Director | Grant or award | +8,143 | — | — |
| Jun 1, 2026 | Diane G. Gerst Director | Grant or award | +8,143 | — | — |
| Jun 1, 2026 | David Russell Gaugh Director | Grant or award | +8,143 | — | — |
| Jun 1, 2026 | Gayle Deflin Director | Grant or award | +8,143 | — | — |
| Jun 1, 2026 | Richard K. Prins Director | Grant or award | +8,143 | — | — |
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